Drill steel guide



Oct. 13, 1936. J I RElLLY l Re. 20,131 I DRILL STEELv GUIDE original Filed Dec. 22, 193s Reissued Oct. 13, 1936 UNITED STATES DRILL STEEL GUIDE John L Remy, Claremont, N. n., assigner to suilivan Machinery Company, a corporation of Massachusetts Original No. 2,026,062, dated December 31, 1935,

Serial No. 703,577, December 22, 1933. Application for reissue March 1I, 1936,k Serial No.

12 Claims. (Cl. 308-4) 'I'his invention relates to guides for drilling implements, and more particularly to a guide for drill steels used in. hammer rock drills for cutting away the rock partitions betweeny adjacent drill holes.

'A common method of quarrying stone in blocks is by line drilling and broaching, a process in which parallel holes are drilled in spaced relation to each other-preferably separated by materially less than their diametersand then connected by broaching out the stone betweenthem sufficiently to form a complete channel. Thisr broaching operation can be performed by a common type of drill steel if the bit be adequately guided during spotting and also during the removal of the web or partition of stone, but prior to my invention, so far as I am advised, no simple, compact and adequate device for accomplishing these functions has been available.

An object of this invention is to provide an improved guide for rock cutting implements. Another object is to provide an improved broaching guide for the drill steel of a. hammer rock drill. A further object is to provide an improved guide for the drill steel of a hammer rock drill for guiding the steel during the cutting away of the rock partitions between adjacent drill holes during a broaching operation. Still another object is to provide an improved guide for the bit of a. rock drill steel which will locate the bit during spotting and guide and position the bit during the further operations of cutting away the relatively thin walls or partitions of rock which separate adjacentholes drilled as the irst step of severing a block of rock from its native mass. Yet another object is to provide an improved broaching apparatus. These and other objects will, however, hereinafter more fully appear in the course of the following description, and as vmore* particularly pointed out in the appendedY claims.

In a preferred embodiment, from one aspect,

my invention may comprise "spaced, connected' guide portions adapted to enter and move down adjacent parallel holes and 'to guide between them and maintain with its axis substantially forward etici .ofthe bit, and inbcompleting the.

cut the forward end of the bit should be free to advance at least to the forward ends of the guides.

From another aspect my invention comprises an improved broaching apparatus including a usual form of drill bit, guiding means as above set forth, and bit actuating means.

In the accompanying drawing there is shown for purposes of illustration one form which the invention may assume in practice.

Fig. 1 is an elevational View of a broacbing type hammer rock drill mounted in drilling position and having associated therewith the improved drill steel guide.

Fig. 2 is a vertical sectional view showing the illustrative form of the improved guide.

Fig. 3 ls a cross sectional view taken on line 3 3 of Fig. 2.

Fig. 4 is a cross sectional view taken on lin 4-4 of Fig. 2.

In this illustrativev construction the improved drill steel guide generally designated I is shown associated Awith a hammer-rock drill generally. designated 2. The `rockdrill. is herein of the mounted type and generally .comprises a pressure fluid actuated hammer motor 3 for precussively actuating a usual rock ,drill steel 4. The hammer motor 3 is guided on parallel feed cylinders l5, 5 of apneumatic feeding motor herein having projecting piston rods 6 connected by a transverse member 1 in turn connected by a rod 8 to the rear end of the hammer motor. The feed cylinders are supported on a swivel trunnlon Il in turn mounted within a clamp III secured to a horizontal support II. Pressure fluid is sup-r plied to the hammer and feed motors through a usual hose connection I2 and through the drill steel 4, which herein is made hollow at I3, to the bottom of the drill hole to blow away the cuttings from the hole. As the rock drill disclosed herein is of a, standard design and does not perse enter into this invention, further description of the detail structure of the same is herein deemed unnecessary.

As above explained, in drilling in accordance with the broaching method in quarries with a. rock drill of the type disclosed. a series of closely adjacent holes Il are drilled in linein the rock, the Vholes being separated by relatively thin walls or partitions I5, sometimes termed cores. After the holes are drilled vthese walls or partitions are drilled or broken away thereby to form a narrow elongated slot in the rock.j I have pro, vided an improved guide for guiding the drill by the guide may be placed laterally imposition,.-V

with respect to the drill steel. The internal faces of the depending portions of 4thecylindricalrguidesv I6, I6 are slotted at I 9 to form avcentral guide; v opening 20 for receiving the cutting bit 2| of the drill steel 4, the outer surfacesof the wings:- 22 of the cutting bit beingguidedzwithin the slots I9, thereby to maintain the:v drill ,steel cenel tered between the cylindrical guide portions I6, I6. The transverse frame portion I1, that=zis;l.the-. U-shaped part of the guide frame which closely embraces the steel also provides vmeans engageable with the cutting bit so when the steel is withdrawn from the drill hole the last means engages the bit ,to move'the guide with the steel, Vthe guide being hung onand supported bythe steel duringsuch withdrawal. Each of the guide por;- tions I6, I6 is providedwith a longitudinal bore 23` so that as the fluid flows .through the bore I3 in the drill steel to the bottom of the drill hole, the cuttings may be blown from the'hole past the guide through the openings 23,23. The cylindrical guide portions I6, I6 substantially tting the adjacentdrill holes I4, I4 provide a substantial bearing` surface for the drill steel and the guide, as the drill steel is fed inwardly, and will maintainthe steel in coaxial alinement with the rock drill and midway between the adjacent drill holes both during spotting and also thereafter during drilling so that the cutting bit ofl the steel will be fed in' a straightpath vthereby to effectively break away the separating'wall or partition between the adjacent drill holes. Y

It will be'observed that'v in this preferred embodlinent,` which is adaptedto use with lugged 1 oi-*collaredv steels having 'integral bits, there are be noted that an improved drill steel guide' is eration. (the beginningv of the cut); ,and since thebit will be freely movable ldownwardly, as the stone is cut away, from therelative position tothe guides shown in Fig'. 1 toV a; position in whichthe bottom of thebit is in the-same plane with lthe4 bottoms of the guides, when the bottom of said-guides reach the bottoms of 'the holes Ill.,` I4, obviously the lguidingA means will be eiective tozguide the lentire broaching operation. n

Asfaafurther resultof Athis invention, it will providedwhich may be readily attached in guidmg position with respect to a drill steel and havinga plurality oficyiindrical guiding portions ttingtwo adjacent holes whereby a substantial V.bearing'surface ls providedtomaintain the drill steel inithe 'desired'path It will further be noted thatthe improved guide is of an extremelysimple and ruggeddesign, which may be manufactured at a minimum of expense-and applied lto a .rock

20.131 p drill steel of a standard design. These and other uses and advantages of the improved guide will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the sameiis shown for purposes of illustration andthat the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters yPatent is:

1i A? drillsteel guide comprising cylindrical guide portionsvarranged in parallel relation for slidinglwguiding the enlarged cutting end of a drill `steelinterposedtherebetween, and an intermediateeyokefshaped v connecting frame extending between saidiguide portions and embracing thez drill steel shank, said connecting frame formed to hang on the enlarged cuttingend of the steel'guidedby and between said guide portions and said connecting frame being` formed with an open side to permitlateral sidewise. removal of the guide from the drill steel shank.

2. A drill steel guide comprising., cylindrical formed to hangon the enlarged cutting end of the steel guided by and between said guide portions and said connecting frame being formed with an open sidetov permit lateral sidewise removal of the guide from the drill steel shank,

said guide portions having openings extendingl therethrough for discharging the cutt'ings from the hole drilled by the drill steel.

3. A guiding tool for use in a boring operation,` comprising cylindrical guide portions arranged in parallel sideby side relation in a. manner to be positioned in parallel bored holes, and a yoke extension formed integral with andextending be,-

tween said cylindrical guide portionsvfor engag ing the shank of areciprocatingfhammer drill steel arranged between saidy cylindrical guide portions and used in boring an adjacent overv lapping hole intermediate:.said-parallel holes for cutting vthe separatingcore between said .parallel bored holes, s'aid yoke being open at one side whereby the drill 'steel and tool are used together withoutpassing'the drill steel inan endwise direction through the tool, and permitting lateral sidewise removal of thel tool from the drill steel shank.

4. A guiding .tool for use in al boring operation,

comprising cylindrical guide portions larranged inparallel side by side relation in a manner to be positioned in parallel bored holes, and a yoke.ex, tension formed integralwith and extending ,be-

tween said cylindrical guide portions for en gaging the shank of a reciprocating hammer drill steel arranged between said cylindrical guide'- portions and used in boring an adjacentoverlapping hole intermediate said parallel holes for` cutting the `separating core1between saidparallel bored holes, said yoke being open at one side whereby the drill steel and tool areusedrtogetlier without-passing the drill steelin an endwise direction through the tool and-permittingLlateral sidewiseremoval of thei tool from the drill steelA shank, said. cylindrical guidexportionshaving. Y

openings' extending ,therethrough for. discharging the cuttings from the hole drilled by the drill steel 5. A guiding tool for use in a boring operation, comprising cylindrical guide portions arranged in parallel side by side relation in a manner to be positioned in parallel bored holes, and a yoke extension formed integral with and extending between said cylindrical guide portions for engaging the shank of a reciprocating rock drill steel for guiding the cutting end of the steel arranged between said cylindrical guide portions and used in boring an adjacent overlapping hole intermediate said parallel holes, said yoke extension being open at one side whereby the drill steel and tool are used together without passing the drill steel in an endwise direction through the guiding tool and permitting lateral sidewise removal of the tool from the shank, said parallel guide portions having formed on their adjacent inner sides longitudinal guideways in which the cutting end of the drill steel is slidably guided.

6. A guiding tool for use in a boring operation, comprising cylindrical guide portions arranged in parallel side by side relation in a manner to be positioned in parallel bored holes, and a yoke extension formed integral with and extending between said cylindrical guide portions for engaging the shank of a reciprocating rock drill steel for guiding the cutting end of the drill steel arranged therebetween and used in boring an adjacent overlapping hole intermediate said parallel holes for cutting the separating core between said parallel bored holes, said yoke extension being formed to hang on the cutting end of the steel during withdrawal of the steel from the bore hole and provided with an open side so that the tool may be placed laterally sidewise on the drill steel shank without passing the drill steel in an endwise direction through the guiding tool, said guide portions when in guiding relation with the cutting end of the steel co-operating with said cutting end for locking the guiding tool against sidewise removal from the drill steel, said guiding tool being releasable from said locking relationship by rearward movement of the guiding tool along the steel shank and when in its unlocked position being removable as aforesaid laterally from the steel shank.

7. A drill steel guide comprising cylindrical guide portions arranged in parallel relation for slidingly guiding the cutting end of a drill steel, and an intermediate yoke-shaped connecting frame extending between said guide portions and embracing the steel shank, said connecting frame `formed to hang on the cutting end of the steel arranged therebetween and guided by said guide portions and said connecting frame being formed to permit lateral sidewise removal of the guide from the drill steel shank and said guide portions cooperating with the cutting end of the steel to lock the guide against lateral removal from the steel when said guide is in guiding relation with respect thereto.

8. A drill steel guide comprising guide portions arranged in parallel relation and spaced to enable them to enter and be guided in a. pair of parallel holes, and means for rigidly connecting said guide portions and maintaining them in such spaced relation, said means of a size to pass down into the space provided as broaching progresses and entering such space as said guide portions travel down said holes, said guide providing means for maintaining the cutting end of a drill bit with its axis in the same plane with the axis of the parallel holes and said guide portions extending forwardly in advance of the forward (cutting) end of the bit when said guide is in its foremost relative position with respect to the bit, whereby the bit is located and held in proper position by said guide during the spotting operation.

9. In an apparatus for broaching out the cores or webs separating parallel holes, means for guiding a drill bit during the starting of the broaching operation and throughout the same including elongated guides positioned to enter such holes, means for connecting said guides, said means of a size to pass d-own into the space provided as broaching progresses and entering such space as said guides travel down said holes, and means for centering the bit in a position between the top and bottom of said guides and with its axis in the same plane with the axes of said guides.

10. A drill steel guide comprising guide portions arranged in parallel relation and spaced to enable them to enter and be guided by a pair of parallel holes, and means for rigidly connecting said guide portions and maintaining them in spaced relation, said means of a size to pass down into the space provided as broaching progresses and entering such space as said guide portions travel down said holes, said guide having at a point thereon to the rear of the forward ends of said guide portions means for centering a drilling implement both midway between said guides and between parallel planes tangent to said holes at the sides of the latter, whereby said guide may locate said implement during a spotting operation.

l1. An attachment for use in the operation of broaching the cores between adjacent parallel holes in stone or similar material and for positioning a vcutting implement during the starting of the broaching operation and guiding it throughout such operation, including a pair of parallel guides each adapted to enter and pass down one of a pair of adjacent parallel holes, means for connecting said guides rigidly together adapted to pass downward through the broached connection to be formed between the holes, and means for guiding a broaching bit providing for relative longitudinal movement between the same and said parallel guides between positions in which said bit has its forward end in the same transverse plane with the forward ends of said guides and in a transverse plane substantially to the rear of said ends whereby said ends may enter parallel holes and locate the bit during spotting, said guiding means arranged to center the bit axis both laterally and transversely with respect to said guides.

12. Apparatus for broaching out cores between adjacent parallel holes in stone including a drill bit adapted to form a round hole of a diameter greater than the distance between the adjacent edges of said holes, means for actuating said bit, and means for positioning said bit during starting of the cutting away of a core and thereafter until such operation is completed at the bottom of the holes, including guiding means positioned to enter and pass down parallel holes, means for rigidly connecting said guiding means, and means for centering the bit with its axis in the same plane with the axes of the holes and also midway between the axes of the holes, in a position in which said bit is to the rear of the forward ends of said guides.

JOHN L. REILLY. 

